Standing in the pavement or near a traffic light at crossroads, these young people smiled and put the signs up high for everyone to see Photo: Tuoi Tre

Standing in the pavement or near a traffic light at crossroads like O Cho Dua, Thai Ha- Lang Ha, Khuat Duy Tien, Giai Phong, Le Van Luong, where a lot of vehicles passed by, these young people smiled and put the signs up high for everyone to see.